Tool-holder for grinding tools



(No Model.)

J. R. KENNETT.

TOOL HOLD-BR FOR GRINDING TOOLS. No. 271.249. Patented Jan.30, 1888.

I To all whom it may concern:

UNITED STATES PATENT O FIC JOHN R. KENNETT, OF GEDDES, NEW YORK.

TOOL-HOLDER FOR GRINDING TOOLS.

- SPECIFICATION forming part of Letters Patent No. 271,249, dated January 30, 1883.

Application filed November 15, 1882. (No model.)

Be it known that I, JOHN R. KENNETT, of Geddes, in the county of Onondaga, in the State of New York, have invented new and j useful Improvements in Tool-Holders for Grind ing Tools, of which the following, taken in con-,

nection with the accompanying drawings, is a full, clear, and exact description.

This invention relates to improved means for holding tools to be sharpened in proper position to bring the cutting-edge thereof at the requisite angle on the grindstone or emery-wheel for grinding said edge.

The invention is fully illustrated in the annexed drawings, wherein Figure 1 illustrates the operation of my improved tool-holder. Fig. 2 is a side view of said tool-holder. Fig. 3 is a top view, and Fig. 4 an inverted plan view, of the same.

Similar letters of reference indicate corresponding parts.

a denotes the tool-supporting plate, of any desirable shape to properly support the tool to be ground, in this case represented with a fiat surface suitable for holding a chisel or plane-knife. This plate is pivoted on top of another plate, It, bymeans of a screw or pin, f, passing through the latter and into' the former. The plate It is provided with a segmental slot, g, which is concentric with the pivotf, and "through the said slot passes a clamp-screw,,i, which is connected with the supporting-plate h, and bears with its head on a washer placed on the under side of the plate h,'as shown in Fig. 4: of the drawings. The aforesaid connection of the plates a and it allows the supporting-plate a to be set at various angles, as ill'ustrated'in Fig. 3 of the drawings, and thus adapts the device for holding tools with oblique as well as right-angled cutting-edges in their requisite position on the grindstone. The plate It is provided with a socket, r, in which is inserted a rod or stem, 1), for the purpose hereinafter explained. 0 denotes the tool-gripping jaw formed in one piece, respectively, with a rearward extension, L, a forward socket, and two downward-projecting arms, K K, by theextremities of which latter the said jaw is hinged or fulcrumed on the sides of the supporting-plate a. A setscrew, (7, passing vertically through the end of the extension Z, and pressing either on top of the supporting-plate a or on the tool resting upon the same, exerts a corresponding downward pressure on the jaw O, fulcrumed on the supporting-plate, as before described, and servingto firmly clamp the tool in position. It is obvious that a wedge or cam can be substituted for the screw d, and I therefore do not limit myself in thatrespect.

In the socket m is inserted a suitable handle, e, for manipulating and guiding the tool-holder.

The described tool-holder is used in the fol- 1owingmanner,viz: To the end ofthegrindstoneframe A is attached a standard, 92, provided with a series of holes at various points in the height thereof. The free end of the stem 1) of the tool-l1older is inserted into such one of the holes in the standard as may be found necessary to bring the tool-holderin. proper position over the grindstone, so as to-grind to the requisite bevel the edge of the tool clamped in the tool-holder. The operator, grasping the handle 0 of the tool-holder, as illustrated in Fig. 1 of the drawings, guides and holds the tool on the grindstone, the standard a resisting the thrust of the tool-holder incident to the friction of the tool bearing on the revolving grindstone.

When it is desired to grind a tool with an oblique cutting-edge the supporting-plate a can be turned on its pivot f and clamped by the clamping-screwi or its equivalent, so as a fand segmental slot 9, the plate It, pivotedon the pin f, the clamping-screw z in slot ty, and the stem b, connected to the plate h, substantially as described a 1d shown.

In testimony whereof 1 are hereunto signed my name and affixed my seal, in the presence of two attesting witnesses, at Syracuse, in the county of Onondaga,in the State of New York, this 31st day of October, 1882.

JOHN R. xnnnnrr. [L. s]

. Witnesses U. H. DUELL, WM. 0. RAYMOND. 

